Seira

"Seira" is introduced as the future princess of the Indian Ocean, the successor who will follow in Sara's place. However, there's just one tiny problem... Seira hasn't been born yet. Despite not yet being born, however, Seira is on some level already a self-aware entity, and she appears to Lucia as a spirit that takes the form of a young mermaid.

Seira's story begins when Lucia hears a child's voice in her dreams, calling for help. Following the source of these mysterious pleas, Lucia dreams that she journeys to the ruins of the Indian Ocean kingdom. There she meets the ghost of Sara, surrounded by tiny spheres of light. Sara explains what the mysterious lights are:

The life breath of the Indian Ocean is forming into spheres of light. These are all gathering together... These spheres of light are called "fragments of the heart." They are necessary for Seira to be born, not just as a mermaid, but as a woman. Love, and friendship, and the power of belief are being gathered into the heart of this girl.

Unfortunately, the extraordinary energy of Seira's "fragments of the heart" are coveted by another: a villainous creature named Michel. He attacks the yet-unborn Seira, stealing the fragments of her heart. Now Lucia must pursue Michel and fight to reclaim the fragments of Seira's heart. Lucia carries the Orange Pearl with her everywhere. When she finds another fragment of Seira's heart, it is absorbed inside the Orange Pearl, and Seira learns how to feel an emotion like love, friendship, or belief in another.During most of the second story arc, Seira seems to exist inside of the Orange Pearl. She can appear before Lucia as an insubstantial spirit, usually to offer encouragement when Lucia is feeling down. When Seira is first introduced in chapter 21, she comes across as somewhat of a brat - and she is, even taking into account her age. For example, she taunts Lucia for crying about Kaito. However, as the manga progresses, and as Seira learns more about love and friendship, she matures greatly. Seira may still be just a little girl, but she comes to understand Lucia's feelings on a profound level. Eventually, Seira becomes Lucia's staunchest supporter.
A Ray of Hope
In chapter 28 of the manga, Seira's spirit-form is absorbed into Michel. Within Michel's heart, Seira tastes profound sadness and loneliness for the first time. And yet, buried beneath Michel's rage and hatred, Seira discovers something else - a "crying voice," as she describes it.

SEIRA: I can feel your sadness... I can hear a voice inside of you, crying out to be saved from this sadness! I can hear a tiny voice crying out, a voice that still believes in this world!
MICHEL: That is only your OWN cry that you hear, and nothing more!

Still, Seira refuses to give up. She begs Lucia and Kaito to "save" Michel, and continually pleads with Michel to realize that he is not alone. Finally, however, the climatic moment arrives. Seira confesses that she cares about Michel, and Michel, in turn, realizes that - unbelievably - there is somebody who loves him.

Unfortunately for Michel, this realization seems to come too late.

The Birth of a Princess

As his castle - and his entire dimension - crumbles around him, Michel sets free Seira's spirit-form, and all of the "spheres of light" (that is, fragments of her heart) that he had stolen from her. He tells Seira to leave, and thanks her for her kindness. Although Seira doesn't want to leave Michel's side, Fuku-chan forces her away. Seira and her spheres of light tumble from Michel's realm of the sky down to the Earth below. Then the spheres of light combine together, and Seira is finally, truly born into the world.

But the battle isn't over. Fuku-chan follows Seira and the mermaid princesses down to Earth, and, overwhelming Michel's will, uses the angelic being as a puppet who attempts to hunt down and destroy the princesses and their allies. Even when confronted with an evil, soul-less Michel, however, Seira's heart aches for him. "Michel really truly is a nice person, just like Michal!" Seira tells Lucia. Seira wants nothing more than to save Michel from Fuku; and with Lucia's help, ultimately, the strength of Seira's love for the forlorn angel is enough to do so.

It is telling that when his moment of salvation comes, Michel's final words of farewell are to Seira, and to Seira only. "Believe that we will meet again someday..." Seira weeps tears of mixed joy and grief as Michel leaves her.Seira ultimately proves herself a profoundly kind, gentle, yet strong person. Her experiences sharing Lucia's emotions, and then Michel's emotions, have taught Seira many things about the strength of love, and the pain of loneliness. During the climax of chapter 30, watching Seira's determination to save Michel during the final battle, Coco even comments, "Sara... The little princess of your kingdom has already become a wonderful friend."
Seira's Forms

mermaid Seira
This is Seira's basic, true shape (first appearance: chapter 21).
human Seira
Seira appears as a human in the color illustration the prefaces chapter 24. She does not, however, actually appear as a human within the actual storyline of the manga, until chapter 30.

Orange Pearl Voice
Seira's superheroine alter-ego (first appearance: chapter 29).

Seira's Powers: Pre-Birth
spirit manifestation - insubstantial
Seira can manifest herself as a ghost or a spirit, but only in her mermaid form.

communication
Seira can communicate to Lucia telepathically, or via dreams. She can also pray to Aqua Regina, and the ocean goddess appears to hear Seira's prayers.

light
When Lucia is feeling down, Seira can make her Orange Pearl glow with a bright, warm light. This seems to have the effect of cheering Lucia up.

spirit manifestation - substantial
In chapter 27, Seira reclaims some of the fragments of her heart from Michel, pulls them into herself, and manifests herself as a very solid, substantial "spirit" form of her mermaid self. Despite the fact that her body appears solid, however, she has not yet been truly "born".

staircase
In chapter 28, in order to allow Lucia/Hanon/Rina to escape Michel, Seira creates a magical staircase that sends the mermaid princesses and Kaito to a distant beach.

Seira's Powers: Post-Birth

transformation
Seira does not use a special phrase or incantation to transform into Orange Pearl Voice; she just does.

singing
Even in her mermaid form (that is, without transforming into her idol form), Seira can sing a song so powerful and moving that it can be heard all over the world - and even in the darkest depths of the ocean's bottom.
Magical Items

Orange Pearl
The Orange Pearl is the source of Seira's power; she needs it to transform into Orange Pearl Voice. In addition, before she was born, Seira existed as a spirit inside of her Orange Pearl.

seashell locket
Like the other mermaids, Seira keeps her pearl in a seashell locket that she wears around her neck. Her locket is orange in color.

microphone
When she transforms into Orange Pearl Voice, Seira uses her microphone to project her singing voice.

Coco

Coco - Mermaid Princess of the South Pacific Ocean and keeper of the yellow pearl. She is incarcerated by the sea monsters for most of the first season, so not much is known about her. In the manga, however, she is a friend of fellow Mermaid Princess Sara. Later, she found to be playful and gentle in the manga, yet brash and outspoken in the anime. Her idol form is Yellow Pearl Voice.


Coco's name could be romanized as either "Koko" or "Coco."

Coco

Coco is the princess of the South Pacific Ocean. Using her Yellow Pearl, she can transform into Yellow Pearl Voice. She can also assume a human form in order to move about on dry land.


Coco has already been captured by Gakuto by the time that the manga begins. She spends the majority of the first story arc asleep within Gakuto's castle.

Coco is a difficult character to understand, especially since she is only active at the very end of the manga. She seems to be a very kind, gentle person with a normally bright, sunny personality. She is often visually associated with yellow daisies. Coco is also very brave, however, and very loyal to her friends - loyal to a fault. And Coco's closest, dearest friend is none other than Sara. When Coco is awoken and freed from Gakuto's castle in chapter 14, she, for some indiscernible reason, decides instead to stay behind with Sara. Perhaps Coco did not want to leave Sara behind. Perhaps Coco had enough faith in the other mermaid princesses to believe that they would come back for her again, and when they did, then she would be able to do something for Sara. Who knows? Coco's motives for willingly staying behind as Gakuto's prisoner are certainly debatable. But when she is awoken again in chapter 19 and realizes that the castle around her is crumbling and that the final battle is occurring, Coco bravely and simply does what she must do. And it is Coco's love, and Coco's song, that ultimately starts Sara back on the path to her true self.

In the second story arc of the manga, Coco has a bit more "screentime," and more of a chance to display her normal, playful personality. It should be noted, however, that in the manga, Coco is a much more gentle person than her rather brash, outspoken anime counterpart. However, like in the anime, Coco still likes to have fun, hang around boys, and occassionally (albeit rarely) displays a sexy, sophisticated side of her personality.

Coco's Forms
mermaid Coco
This is Coco's basic, true shape (first appearance: chapter 14).
Coco also appears as a faceless, sketchy background figure in chapters 2, 3, and 8-10.

Coco
Coco in her human form (first appearance: chapter 24).

Yellow Pearl Voice
Coco's superheroine alter-ego (first appearance: chapter 20).

Coco does not appear as a mermaid princess. Yellow Pearl Voice only has one outfit in the manga, and has received no power-ups. However, her one and only idol outfit is indeed analogous with the "second" idol outfits of the other mermaid princesses; it has double-layered gloves, boots, and ruffles.
Coco's Powers

transformation
Coco does not use a special phrase or incantation to transform into Yellow Pearl Voice; she just does.

singing
Despite being without her pearl, Coco can still sing a song emotionally powerful enough to move the heart of even Sara, as she does in chapter 19. Although granted, in chapter 19, when Coco sings, she also eventually gains the help of the other mermaid princesses singing along with her.
Magical Items
Yellow Pearl
The Yellow Pearl is the source of Coco's power; she needs it to transform into Yellow Pearl Voice.

seashell locket
Like the other mermaids, Coco keeps her pearl in a seashell locket that she wears around her neck. Her locket is yellow in color.

microphone
When she transforms into Yellow Pearl Voice, Coco uses her microphone to project her singing voice.

key rod
In chapter 29, Coco takes the magical Key Rod from Hippo, and uses it to fight Michel.

Black Beauty Sisters

Black Beauty Sisters - composed of the red-wearing older sister Sheshe and the blue-wearing younger sister Mimi . Gakuto hires them after the Dark Lovers' failed attempts to capture the Mermaid Princesses. These two have the ability to sing tunes more powerful than the songs the Mermaid Princesses themselves sing, although in the anime and the second arc of the manga, the Princesses manage to get strong enough to overpower them. Though Gakuto turned them back to their original forms (two angler fishes), they were brought back in the second season. Their group name is usually shortened by fans to BBS.

o Many fans think that the name "Black Beauty Sisters" is just a stage name, as Mimi and Sheshe seem to be in love, and sister can mean other things that would apply to the two, such as sharing the same origin. But, in the manga, they are only seen hugging at the worst, never really looking as if about to kiss like shown in the anime.